def _delRowsByProp(self, prop, valu=None, mintime=None, maxtime=None):
indx = self.index_pt if valu is None else self.index_pvt
first_key, last_key, v_is_hashed, do_fast_compare = _calcFirstLastKeys(prop, valu,
mintime, maxtime)
with self._getTxn(write=True) as txn, txn.cursor(indx) as cursor:
if not cursor.set_range(first_key):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
while True:
key, pk_enc = cursor.item()
if do_fast_compare:
if key[:len(first_key)] != first_key:
break
else:
if key.tobytes() >= last_key:
break
if self._delRowAndIndices(txn, pk_enc,
delete_pt=(valu is not None),
delete_pvt=(valu is None),
only_if_val=(valu if v_is_hashed else None)):
# Delete did go through: delete entry at cursor
if not cursor.delete():
raise s_common.BadCoreStore(store='lmdb', mesg='Delete failure')
else:
# Delete didn't go through: advance to next
if not cursor.next():
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
def _delRowsById(self, iden):
i_enc = _encIden(iden)
with self._getTxn(write=True) as txn, txn.cursor(
self.index_ip) as cursor:
# Get the first record >= i_enc
if not cursor.set_range(i_enc):
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing sentinel')
while True:
# We don't use iterator here because the delete already advances to the next
# record
key, value = cursor.item()
if key[:len(i_enc)] != i_enc:
return
p_enc = key[len(i_enc):].tobytes()
# Need to copy out with tobytes because we're deleting
pk_enc = value.tobytes()
if not cursor.delete():
raise s_common.BadCoreStore(store='lmdb',
mesg='Delete failure')
self._delRowAndIndices(txn,
pk_enc,
i_enc=i_enc,
p_enc=p_enc,
delete_ip=False)
def getRowsByProp(self, prop, valu=None, limit=None, mintime=None, maxtime=None,
do_count_only=False):
indx = self.index_pt if valu is None else self.index_pvt
first_key, last_key, v_is_hashed, do_fast_compare = _calcFirstLastKeys(prop, valu,
mintime, maxtime)
count = 0
rows = []
with self._getTxn() as txn, txn.cursor(indx) as cursor:
if not cursor.set_range(first_key):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
while True:
if limit is not None and count >= limit:
break
key, pk_enc = cursor.item()
if do_fast_compare:
if key[:len(first_key)] != first_key:
break
else:
if key.tobytes() >= last_key:
break
if v_is_hashed or not do_count_only:
row = self._getRowByPkValEnc(txn, pk_enc)
if v_is_hashed:
if row[2] != valu:
continue
if not do_count_only:
rows.append(row)
count += 1
if not cursor.next():
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
return count if do_count_only else rows
def _delRowsByIdProp(self, iden, prop, valu=None):
i_enc = _encIden(iden)
p_enc = _encProp(prop)
first_key = i_enc + p_enc
with self._getTxn(write=True) as txn, txn.cursor(self.index_ip) as cursor:
# Retrieve and delete I-P index
if not cursor.set_range(first_key):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
while True:
# We don't use iterator here because the delete already advances to the next
# record
key, value = cursor.item()
if key[:len(first_key)] != first_key:
return
# Need to copy out with tobytes because we're deleting
pk_enc = value.tobytes()
# Delete the row and the other indices
if not self._delRowAndIndices(txn, pk_enc, i_enc=i_enc, p_enc=p_enc,
delete_ip=False, only_if_val=valu):
if not cursor.next():
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
else:
if not cursor.delete():
raise s_common.BadCoreStore(store='lmdb', mesg='Delete failure')
def _delRowAndIndices(self,
txn,
pk_enc,
i_enc=None,
p_enc=None,
v_key_enc=None,
t_enc=None,
delete_ip=True,
delete_pvt=True,
delete_pt=True,
only_if_val=None):
''' Deletes the row corresponding to pk_enc and the indices pointing to it '''
with txn.cursor(self.rows) as cursor:
if not cursor.set_key(pk_enc):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing PK')
i, p, v, t = s_msgpack.un(cursor.value())
if only_if_val is not None and only_if_val != v:
return False
cursor.delete()
if delete_ip and i_enc is None:
i_enc = _encIden(i)
if p_enc is None:
p_enc = _encProp(p)
if delete_pvt and v_key_enc is None:
v_key_enc = _encValKey(v)
if (delete_pvt or delete_pt) and t_enc is None:
t_enc = s_msgpack.en(t)
if delete_ip:
# Delete I-P index entry
if not txn.delete(i_enc + p_enc, value=pk_enc, db=self.index_ip):
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing I-P index')
if delete_pvt:
# Delete P-V-T index entry
if not txn.delete(p_enc + v_key_enc + t_enc,
value=pk_enc,
db=self.index_pvt):
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing P-V-T index')
if delete_pt:
# Delete P-T index entry
if not txn.delete(p_enc + t_enc, value=pk_enc, db=self.index_pt):
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing P-T index')
return True
def _addRows(self, rows):
'''
Adds a bunch of rows to the database
Take care: this was written this way for performance, in particular when len(rows) is
large.
'''
encs = []
with self._getTxn(write=True) as txn:
next_pk = self.next_pk
# First, we encode all the i, p, v, t for all rows
for i, p, v, t in rows:
if next_pk > MAX_PK:
raise s_common.HitCoreLimit(
name='MAX_PK',
size=MAX_PK,
mesg='Out of primary key values')
if len(p) > MAX_PROP_LEN:
raise s_common.HitCoreLimit(
name='MAX_PROP_LEN',
size=MAX_PROP_LEN,
mesg='Property length too large')
i_enc = _encIden(i)
p_enc = _encProp(p)
v_key_enc = _encValKey(v)
t_enc = s_msgpack.en(t)
pk_enc = _encPk(next_pk)
row_enc = s_msgpack.en((i, p, v, t))
# idx 0 1 2 3 4 5
encs.append((i_enc, p_enc, row_enc, t_enc, v_key_enc, pk_enc))
next_pk += 1
# An iterator of what goes into the main table: key=pk_enc, val=encoded(i, p, v, t)
kvs = ((x[5], x[2]) for x in encs)
# Shove it all in at once
consumed, added = txn.cursor(self.rows).putmulti(kvs,
overwrite=False,
append=True)
if consumed != added or consumed != len(encs):
# Will only fail if record already exists, which should never happen
raise s_common.BadCoreStore(store='lmdb',
mesg='unexpected pk in DB')
# Update the indices for all rows
kvs = ((x[0] + x[1], x[5]) for x in encs)
txn.cursor(self.index_ip).putmulti(kvs, dupdata=True)
kvs = ((x[1] + x[4] + x[3], x[5]) for x in encs)
txn.cursor(self.index_pvt).putmulti(kvs, dupdata=True)
kvs = ((x[1] + x[3], x[5]) for x in encs)
txn.cursor(self.index_pt).putmulti(kvs, dupdata=True)
# self.next_pk should be protected from multiple writers. Luckily lmdb write lock does
# that for us.
self.next_pk = next_pk
def _hasBlobValu(self, key):
rows = self._getBlobValuRows(key)
if len(rows) > 1: # pragma: no cover
raise s_common.BadCoreStore(store=self.getCoreType(), mesg='Too many blob rows received.')
if not rows:
return False
return True
def getRowsByIdProp(self, iden, prop, valu=None):
# For now not making a ipv index because multiple v for a given i,p are probably rare
iden_enc = _encIden(iden)
prop_enc = _encProp(prop)
first_key = iden_enc + prop_enc
ret = []
with self._getTxn() as txn, txn.cursor(self.index_ip) as cursor:
if not cursor.set_range(first_key):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
for key, value in cursor:
if key.tobytes() != first_key:
return ret
row = self._getRowByPkValEnc(txn, value)
if valu is not None and row[2] != valu:
continue
ret.append(row)
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
def _subrangeRows(self, p_enc, first_val, last_val, limit, right_closed,
do_count_only):
''' Performs part of a range query, either completely negative or non-negative '''
first_key = p_enc + _encValKey(first_val)
am_going_backwards = (first_val < 0)
last_key = p_enc + _encValKey(last_val)
ret = []
count = 0
# Figure out the terminating condition of the loop
if am_going_backwards:
term_cmp = bytes.__lt__ if right_closed else bytes.__le__
else:
term_cmp = bytes.__gt__ if right_closed else bytes.__ge__
with self._getTxn() as txn, txn.cursor(self.index_pvt) as cursor:
if not cursor.set_range(first_key):
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing sentinel')
if am_going_backwards:
# set_range sets the cursor at the first key >= first_key, if we're going backwards
# we actually want the first key <= first_key
if cursor.key()[:len(first_key)].tobytes() > first_key:
if not cursor.prev():
raise s_common.BadCoreStore(store='lmdb',
mesg='Missing sentinel')
it = cursor.iterprev(keys=True, values=True)
else:
it = cursor.iternext(keys=True, values=True)
for key, value in it:
if term_cmp(key[:len(last_key)].tobytes(), last_key):
break
if limit is not None and count >= limit:
break
if not do_count_only:
ret.append(self._getRowByPkValEnc(txn, value))
count += 1
return count if do_count_only else ret
def getRowsById(self, iden):
iden_enc = _encIden(iden)
rows = []
with self._getTxn() as txn, txn.cursor(self.index_ip) as cursor:
if not cursor.set_range(iden_enc):
raise s_common.BadCoreStore(store='lmdb', mesg='Missing sentinel')
for key, pk_enc in cursor:
if key[:len(iden_enc)] != iden_enc:
break
rows.append(self._getRowByPkValEnc(txn, pk_enc))
return rows
def _getRowByPkValEnc(self, txn, pk_enc):
row = txn.get(pk_enc, db=self.rows)
if row is None:
raise s_common.BadCoreStore(store='lmdb', mesg='Index val has no corresponding row')
return s_msgpack.un(row)
def _initDbConn(self):
dbinfo = self._initDbInfo()
dbname = dbinfo.get('name')
# Initial DB Size. Must be < 2 GiB for 32-bit. Can be big for 64-bit systems. Will create
# a file of that size. On Windows, will actually immediately take up that much
# disk space.
DEFAULT_MAP_SIZE = 512 * 1024 * 1024
# _write_lock exists solely to hold off other threads' write transactions long enough to
# potentially increase the map size.
self._write_lock = Lock()
map_size = self._link[1].get('lmdb:mapsize', DEFAULT_MAP_SIZE)
self._map_size, _ = s_datamodel.getTypeNorm('int', map_size)
self._max_map_size = 2**46 if sys.maxsize > 2**32 else 2**30
map_slack = self._link[1].get('lmdb:mapslack', 2 ** 30)
self._map_slack, _ = s_datamodel.getTypeNorm('int', map_slack)
# Maximum number of 'databases', really tables. We use 5 different tables (1 main plus
# 3 indices and a blob store), + 10 tables for possible migration use cases.
MAX_DBS = 5 + 10
# flush system buffers to disk only once per transaction. Set to False can lead to last
# transaction loss, but not corruption
metasync_val = self._link[1].get('lmdb:metasync', False)
metasync, _ = s_datamodel.getTypeNorm('bool', metasync_val)
metasync = (metasync == 1)
# If sync is False, could lead to database corruption on power loss
sync_val = self._link[1].get('lmdb:sync', True)
sync, _ = s_datamodel.getTypeNorm('bool', sync_val)
sync = (sync == 1)
# Write data directly to mapped memory
WRITEMAP = True
# Doesn't create a subdirectory for storage files
SUBDIR = False
# We can disable locking, but bad things might happen if we have multiple threads
DEFAULT_LOCK = True
lock_val = self._link[1].get('lmdb:lock', DEFAULT_LOCK)
lock, _ = s_datamodel.getTypeNorm('bool', lock_val)
lock = (lock == 1)
# Maximum simultaneous readers.
MAX_READERS = 4
max_readers = self._link[1].get('lmdb:maxreaders', MAX_READERS)
max_readers, _ = s_datamodel.getTypeNorm('int', max_readers)
if max_readers == 1:
lock = False
self.dbenv = lmdb.Environment(dbname,
map_size=self._map_size,
subdir=SUBDIR,
metasync=metasync,
writemap=WRITEMAP,
max_readers=max_readers,
max_dbs=MAX_DBS,
sync=sync,
lock=lock)
# Check we're not running a weird version of LMDB
if self.dbenv.stat()['psize'] != 4096:
raise s_common.BadCoreStore(store='lmdb', mesg='Unknown version of lmdb configured')
# Ensure we have enough room in the map for expansion
self._ensure_map_slack()
def onfini():
self.dbenv.close()
self.onfini(onfini)
